CN106252879B - Double-circular-polarization linear array with line-fed cross-shaped seam - Google Patents
Double-circular-polarization linear array with line-fed cross-shaped seam Download PDFInfo
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- CN106252879B CN106252879B CN201610789432.4A CN201610789432A CN106252879B CN 106252879 B CN106252879 B CN 106252879B CN 201610789432 A CN201610789432 A CN 201610789432A CN 106252879 B CN106252879 B CN 106252879B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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Abstract
The invention relates to a double circular polarized linear array with a wire feed cross seam, which comprises a metal cavity and a first metal conduction band, wherein the first metal conduction band is positioned in the metal cavity, the metal cavity is provided with a metal cavity upper cover plate and a metal cavity lower base plate, the first metal conduction band is arranged in parallel with the metal cavity lower base plate, two ends of the first metal conduction band are bent downwards and penetrate through the metal cavity lower base plate to be respectively used as a left-handed feed port and a right-handed feed port, more than two cross seams are uniformly arranged on the metal cavity upper cover plate, a microstrip plate is arranged above the metal cavity upper cover plate, more than two metal patches are arranged on the surface of one side of the microstrip plate corresponding to the cross seams, the metal patches and the cross seams are arranged in one-to-one correspondence, and the vertical projection of the geometric center of any metal patch on the plane of the first metal conduction band is taken as the central projection, the axial direction of the first metal conduction band deviates from the central projection.
Description
Technical Field
The invention relates to the technical field of phased array antennas, in particular to a double circular polarized linear array with a linear feed cross-shaped seam.
Background
The array antenna is widely applied to the mobile communication fields of airborne, ship-borne, vehicle-mounted and the like, and low profile and miniaturization of the array antenna are required in order to meet the requirements of a mobile carrier on wind resistance. The low-profile panel antenna has two implementation forms, namely an oblique wave beam panel array and a phased array antenna, is widely applied and has the advantages. The phased array antenna is divided into a one-dimensional electric scanning mode and a two-dimensional electric scanning mode, the cost of the phased array antenna is relatively low, and the price advantage of the one-dimensional electric scanning mode is more obvious in the field of mobile satellite televisions, particularly when the requirement on antenna gain is high. The linear array elements forming the phased array are particularly important at this time.
The transmission mode of the geostationary satellite signal above the earth is mostly linear polarization, both horizontal polarization and vertical polarization exist, because the longitude and latitude of the satellite above the equator are generally different from the latitude of the receiving ground, the polarization direction of the horizontal or vertical polarized wave sent by the satellite after reaching the receiving ground can be changed, and the dual-polarized antenna can realize polarization tracking, and not only can be dual-linear polarization, but also can be dual-circular polarization. Most of the existing phased-array antenna units can not realize double circular polarization, and the phased-array antenna capable of realizing the double circular polarization has two forms, one is a micro-strip form, and the other is a ridge waveguide structure. The loss of the microstrip antenna in a Ku frequency band is large, so that the scale of a product is small, the gain of the antenna is not high, or a mixed feed mode is adopted, and the later stages of synthesis networks adopt a waveguide structure. An antenna in the form of a ridge waveguide requires two circularly polarized waveguides to be placed alternately. The antenna with the two structural forms has complex structure and high cost.
Disclosure of Invention
The invention aims to provide a double circular polarization linear array with a linear feed cross seam, which can realize double circular polarization, and has simple structure and low cost.
In order to achieve the purpose, the invention provides a double circular polarized linear array with a linear feed cross seam, which comprises a metal cavity and a first metal conduction band with the same width, wherein the first metal conduction band is positioned in the metal cavity, the metal cavity is provided with a metal cavity upper cover plate and a metal cavity lower base plate, the first metal conduction band is arranged in parallel with the metal cavity lower base plate, two ends of the first metal conduction band are bent downwards and penetrate through the metal cavity lower base plate to be respectively used as a left-handed feed port and a right-handed feed port, more than two cross seams are uniformly arranged on the metal cavity upper cover plate, a micro-strip plate is arranged above the metal cavity upper cover plate, more than two metal patches are arranged on the surface of one side of the micro-strip plate corresponding to the cross seams, the metal patches and the cross seams are arranged in one-to-one correspondence, and the geometric center of any metal patch is projected as the center in the vertical projection of the plane of the first metal conduction band And the axial direction of the first metal conduction band deviates from the central projection.
According to the technical scheme, the first metal conduction band is located in the metal cavity to form a strip line transmission line structure, both ends of the strip line transmission line can be fed, the left-handed circular polarization can be realized through the left-handed feeding port, and the right-handed circular polarization can be realized through the right-handed feeding port, so that the double-circular polarization is realized. The single strip line is adopted for feeding, two kinds of circular polarization are respectively realized at two ends, the structure is simple, and the cost is reduced.
Preferably, the two gaps of the crossed cross seam are vertically and crosswise arranged in the directions of plus and minus 45 degrees.
Preferably, the geometric center of the cross-shaped seam coincides with the geometric center of the metal patch.
Preferably, still be equipped with another and the parallel second metal conduction band of first metal conduction band in the metal cavity, second metal conduction band with first metal conduction band is located the coplanar, second metal conduction band is located central projected opposite side, just first metal conduction band and second metal conduction band are symmetrical about central projection, second metal conduction band both ends also downwarping and pass metal cavity lower plate is regarded as levogyration and is fed the mouth with dextrorotation respectively, levogyration of second metal conduction band is fed the mouth and is fed the mouth with dextrorotation and is located same one side with the dextrorotation of first metal conduction band.
Preferably, more than two medium supporting blocks are further arranged in the metal cavity, the more than two medium supporting blocks are fixed on the upper cover plate of the metal cavity, a gap is reserved between the medium supporting blocks and the lower bottom plate of the metal cavity, and the medium supporting blocks wrap the first metal conduction band and the second metal conduction band.
Preferably, first metal conduction band is formed by the concatenation of the first short metal conduction band that length equals more than two, second metal conduction band is formed by the concatenation of the short metal conduction band of second that length equals more than two, first short metal conduction band with the length of the short metal conduction band of second also equals, each first short metal conduction band with the short metal conduction band of second all has first end and second end, the first end of first short metal conduction band with the second end of the short metal conduction band of second is located same one side, the first end is as levogyration feed mouth, the second end is as dextrorotation feed mouth.
Preferably, the linear array further comprises a low noise amplifier, and the first end and the second end are both connected with a microstrip line of the low noise amplifier.
Preferably, two or more cross-shaped slits are arranged at equal intervals, and two or more metal patches are arranged at equal intervals.
Preferably, the metal patch is square.
Preferably, the metal cavity is an air cavity.
The invention has the following advantages: (1) the invention adopts the equal-width strip line to form the traveling wave array, obtains two orthogonal circular polarizations at two ends of the linear array, and has simple structure and low cost.
(2) On one hand, in order to improve the efficiency of the antenna, an air strip line form is adopted in the Ku frequency band. On the other hand, in order to overcome the influence of the change of the beam direction of the traveling wave array in the frequency band on satellite tracking, the invention adopts a double-strip-line structure and utilizes the medium supporting block to realize a slow-wave structure, thereby not only meeting the requirement that the center frequency points to the normal direction, but also realizing the requirement that the loss of the air strip line is reduced. The symmetrical two ends are fed with constant amplitude to realize the uniformity of amplitude distribution and overcome the problem of beam pointing deviation. Therefore, the double feed lines adopted by the linear array enable the pointing angle to point to the normal direction, and the pointing angle of the antenna in a frequency band is effectively guaranteed to be unchanged.
(3) When the bandwidth requirement is contradictory with the linear array scale, the method is used for expanding the linear array in sections. The metal conduction band bends downwards, the same structure is kept, correction compensation is carried out at the bent angle, the sheet is converted into a needle structure and penetrates through the lower bottom plate of the metal cavity to be directly connected with the LNA microstrip line, and therefore the feed efficiency of the whole linear array is very high. By integrally combining the LNA at the feed end, the noise coefficient of the antenna is well improved, the design of a synthesis network is simplified, the maximization of the efficiency is realized, and the noise coefficient is reduced.
Drawings
FIG. 1 is a schematic diagram of a first metal conduction band and left and right hand feed ports in one embodiment of the present invention;
FIG. 2 is a schematic diagram of the structures of a first metal conduction band, a second metal conduction band and a metal cavity in one embodiment of the invention;
FIG. 3 is a schematic structural diagram of a first metal conduction band, a second metal conduction band and a dielectric support block in one embodiment of the invention;
FIG. 4 is a schematic view of an embodiment of the present invention with the microstrip plate and the cover plate of the metal chamber removed;
FIG. 5 is a schematic structural diagram of one embodiment of the present invention;
FIG. 6 is a standing wave diagram of an antenna according to an embodiment of the present invention;
fig. 7 is an antenna right-hand polarization pattern of one embodiment of the present invention;
fig. 8 is an antenna left hand polarization pattern of one embodiment of the present invention.
The meaning of the reference symbols in the drawings:
1-microstrip board 2-metal patch 3-cross seam 4-medium supporting block
5-first metal conduction band/second metal conduction band 6-metal cavity
7-left-handed feeding port and 8-right-handed feeding port
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The double circular polarization linear array of the strip line feed cross joint 3 provided by the embodiment of the invention comprises a metal cavity 6 and a first metal conduction band 5 with the same width, wherein the first metal conduction band 5 is positioned in the metal cavity 6, the metal cavity 6 is provided with a metal cavity 6 upper cover plate and a metal cavity 6 lower base plate, the first metal conduction band 5 is arranged in parallel with the metal cavity 6 lower base plate, two ends of the first metal conduction band 5 are bent downwards and penetrate through the metal cavity 6 lower base plate to be respectively used as a left-handed feed port 7 and a right-handed feed port 8, more than two cross joints 3 are uniformly arranged on the metal cavity 6 upper cover plate, a micro-strip plate 1 is arranged above the metal cavity 6 upper cover plate, more than two metal patches 2 are arranged on one side surface of the micro-strip plate 1 corresponding to the cross joints 3, and the metal patches 2 and the cross joints 3 are arranged in a one-to-one correspondence manner, the vertical projection of the geometric center of any metal patch 2 on the plane of the first metal conduction band 5 is a central projection, and the axial direction of the first metal conduction band 5 deviates from the central projection. Referring to fig. 1, 5 represents the metal conduction band, 7 is the left feeding port, and 8 is the right feeding port.
First metal conduction band 5 is located inside metal cavity 6, first metal conduction band 5 is located the air cavity promptly, forms the strip transmission line structure, can all feed from the both ends of strip transmission line, and wherein levogyration feed mouth 7 can realize the left hand circular polarization, and dextrorotation feed mouth 8 can realize the dextrorotation circular polarization to dual circular polarization has been realized. The traveling wave array is formed by adopting the first metal conduction band 5, two circular polarizations can be obtained at two sides of the linear array, and the traveling wave array is simple in structure, easy to implement and low in cost.
The direction and the distance of the central projection from the metal conduction band determine the rotation direction and the axial ratio of circular polarization; due to this feature, if one end of the metal conduction band is fed with left-hand circular polarization, the other end is fed with right-hand circular polarization.
Preferably, the upper cover plate of the metal cavity 6 is parallel to the lower bottom plate of the metal cavity 6, and in this case, the first metal conduction band 5 is also parallel to the upper cover plate of the metal cavity 6. Preferably, the metal cavity 6 is an air cavity.
Preferably, in some preferred embodiments of the linear array of the present invention, two slots of the cross-shaped slot 3 are vertically crossed in the positive and negative 45-degree directions. I.e. the two slits intersect perpendicularly, but the length of each slit deviates from the length of the metal cavity 6 by an angle of + -45 deg..
Further, in other preferred embodiments of the linear array of the present invention, the geometric center of the cross-shaped slit 3 coincides with the geometric center of the metal patch 2.
Further, in other preferred embodiments of the linear array of the present invention, two or more cross-shaped slits 3 are arranged at equal intervals, and two or more metal patches 2 are arranged at equal intervals. Namely, the crossed cross seams 3 and the metal patches 2 are arranged at equal intervals along the direction of the strip transmission line, and the crossed cross seams 3 and the metal patches 2 are arranged at equal intervals to reduce the structural design and processing difficulty. Optionally, the metal patch 2 is square.
In practical application, the metal conduction band adopts a metal conduction band with equal width. The circularly polarized linear array is a traveling wave array, the size of the square metal patch 2 is related to the radiation efficiency in the frequency band, and the size of the square patch can be selected according to the scale of the linear array, namely the number of units.
Preferably, in another preferred embodiment of the linear array of the present invention, another second metal conduction band parallel to the first metal conduction band 5 is further disposed in the metal cavity 6, the second metal conduction band and the first metal conduction band 5 are located in the same plane, the second metal conduction band is located on the other side of the central projection, the first metal conduction band 5 and the second metal conduction band are symmetric with respect to the central projection, two ends of the second metal conduction band are also bent downward and pass through the lower bottom plate of the metal cavity 6 to serve as a left-handed feeding port 7 and a right-handed feeding port 8, respectively, and the left-handed feeding port 7 of the second metal conduction band and the right-handed feeding port 8 of the first metal conduction band 5 are located on the same side. Namely, the axial directions of the first metal conduction band 5 and the second metal conduction band are deviated from the geometric center of the metal patch 2, and the two metal conduction bands are correspondingly distributed on two sides of the geometric center of the metal patch 2. The two metal guide belts are in mirror image relation along the axis of the metal patch 2 and are parallel to each other along the transmission direction. When the geometric center of the cross slit 3 coincides with the geometric center of the metal patch 2, this central projection is also a perpendicular projection of the geometric center of the cross slit 3 on the plane of the first metal conduction band 5. Referring to fig. 2, where 3 denotes the cross slit, the right-hand feed port 8 of the first metal strip 5 and the left-hand feed port 7 of the second metal strip are located on the same side.
The end part of the first metal conduction band 5 on the same side with the second metal conduction band radiates orthogonal circular polarization, and the end part of the first metal conduction band 5 on the different side with the second metal conduction band radiates the same circular polarization. Since the direction and distance of the central projection from the metal conduction band determine the handedness and axial ratio of circular polarization. Therefore, in the position relationship that the first metal conduction band 5 and the second metal conduction band are symmetrically distributed along the central projection, the directions of the first metal conduction band 5 and the second metal conduction band which deviate from the central projection are opposite, and therefore the rotation directions of the feed ends of the two metal conduction bands in the same direction are also opposite.
Because the amplitude distribution of the traveling wave array is high in front and low in back, the two ports located on different sides feed in the same amplitude, the amplitude distribution of the linear array can be more uniform, and certainly, because the two metal conduction bands are coupled, the cross polarization is influenced. In practical application, the central frequency of the working bandwidth can be selected, the directional diagram of the port feeding linear array points to the normal direction, and the ports on the two sides feed simultaneously, so that the synthetic gain of the linear array is higher. The different side feeding can ensure that the direction of the synthesized beam is not changed in the frequency band, thereby overcoming the influence of the change of the direction of the traveling wave array beam in the frequency band on satellite tracking.
Preferably, in other preferred embodiments of the linear array of the present invention, two or more medium support blocks 4 are further disposed in the metal cavity 6, and the two or more medium support blocks 4 are fixed on an upper cover plate of the metal cavity 6, leave a gap with a lower bottom plate of the metal cavity 6, and wrap the first metal conduction band 5 and the second metal conduction band.
Referring to fig. 3, the dielectric support blocks 4 are disposed on the first metal conduction band 5 and the second metal conduction band at a certain distance, so that the dielectric support blocks 4 are fixed in the metal cavity 6, and on the other hand, the metal conduction band is wrapped by the dielectric support blocks 4, which is equivalent to a slow-wave structure, and on the premise that the distance between the antenna units, that is, the distance between the metal patches 2 is smaller than one wavelength, the transmission distance of a signal between the two antenna units is exactly one working wavelength through the straight metal conduction band with a constant width. Therefore, the wave beam of the traveling wave array is ensured to point to the normal direction of the linear array, and simultaneously, the grating lobe is avoided.
Preferably, in another preferred embodiment of the present invention, the first metal conduction band 5 is formed by splicing more than two first short metal conduction bands with equal lengths, the second metal conduction band is formed by splicing more than two second short metal conduction bands with equal lengths, the lengths of the first short metal conduction band and the second short metal conduction band are also equal, each of the first short metal conduction band and the second short metal conduction band has a first end and a second end, the first end of the first short metal conduction band and the second end of the second short metal conduction band are located on the same side, the first end serves as the left-handed feeding port 7, and the second end serves as the right-handed feeding port 8.
Referring to fig. 4 and 5, when the linear array size is large and the bandwidth requirement is high, the linear array may be divided into several segments. In this embodiment, the linear array is divided into two segments. Namely, the first metal conduction band 5 is formed by splicing two first short metal conduction bands with equal lengths, the second metal conduction band is formed by splicing two second short metal conduction bands with equal lengths, and the lengths of the first short metal conduction band and the second short metal conduction band are also equal. In specific application, the metal cavity 6 is correspondingly divided into two separate cavities, that is, a transverse plate for dividing the cavity into two small cavities is arranged in the metal cavity 6. Namely, the distance between the short metal conduction band and the two side walls of the metal cavity 6 is ensured to follow the original band line structure requirement.
The different side feeds can ensure that the pointing direction of the synthesized beam does not change in the frequency band, but obviously the bandwidth of the synthesized beam is also limited, the synthesis gain of the synthesized beam is determined by the deviation of the pointing direction of the side frequency beam and the beam width of the linear array, and the two jointly determine the intersection point level of the different side beams. The linear array is divided into two parts, the beam width of the independent partial linear array is doubled, and the deviation of the bearable beam pointing is increased, so that the linear array bandwidth is correspondingly increased.
After the linear array is divided into two parts, the first metal conduction band 5 and the second metal conduction band are also respectively divided into two short metal conduction bands, namely a first short metal conduction band positioned above the left metal small cavity, a second short metal conduction band positioned below the left metal small cavity, a first short metal conduction band positioned above the right metal small cavity, and a second short metal conduction band positioned below the right metal small cavity; therefore, the first metal conduction band 5 and the second metal conduction band both have four ports, which are eight ports in total, wherein four feed ports radiate left-handed circular polarization, the other four feed ports radiate right-handed circular polarization, the port distribution is as shown in fig. 5, the right port of the first short metal conduction band positioned above the left metal small cavity and the left port of the second short metal conduction band positioned below the left metal small cavity are left-handed feed ports 7, and the left port of the first short metal conduction band positioned above the left metal small cavity and the right port of the second short metal conduction band positioned below the left metal small cavity are right-handed feed ports 8; the right port of the first short metal conduction band above and the left port of the second short metal conduction band below are left-handed feeding ports 7, the left port of the first short metal conduction band above and the right port of the second short metal conduction band below are right-handed feeding ports 8; and the ports of the first short metal conduction band and the second short metal conduction band feed simultaneously, the left-handed feeding port 7 radiates left-handed circularly polarized signals, and the right-handed feeding port 8 radiates right-handed circularly polarized signals.
Referring to fig. 4 and 5, in this embodiment, each short metal conduction band is wrapped by 11 dielectric support blocks 4, 22 dielectric support blocks 4 divide the metal conduction band into 24 sections, and a cross slot 3 and a metal patch 2 are correspondingly arranged above each section. The first metal conduction band 5 and the second metal conduction band are parallel along the transmission direction, two ends of each short metal conduction band are vertically bent, a cylinder is formed at the tail end, and the feeding end is in a coaxial form.
Preferably, in some preferred embodiments of the present invention, the linear array further includes a low noise amplifier, and the first end and the second end are both connected to a microstrip line of the low noise amplifier. I.e. the eight ports shown in fig. 5 are all connected to the microstrip line of the low noise amplifier.
In order to guarantee the efficiency of the antenna, the LNA low noise amplifier and the linear array can be combined together, the first metal conduction band 5 and the second metal conduction band bend downwards to form a round needle, the round needle can be directly welded with the microstrip line of the LNA after passing through the lower base plate of the metal cavity 6, the strip line structure is unchanged after the strip line bends downwards, and compensation matching is carried out at the bent angle. This can maximize efficiency and reduce noise figure.
Fig. 6 shows a dual circularly polarized linear array standing wave with a linear feed cross slit 3 according to an embodiment of the present invention;
fig. 7 shows a right-hand polarization directional diagram of a double circularly polarized linear array of the cross slit 3 with a wire feed according to an embodiment of the present invention;
fig. 8 shows a left-hand polarization directional diagram of a dual circularly polarized linear array with a wire-fed cross slit 3 according to an embodiment of the present invention.
Claims (10)
1. The double circular polarized linear arrays with the linear feed cross seams (3) is characterized in that the linear arrays comprise metal cavities (6) and first metal guide belts (5) with the same width, the first metal guide belts (5) are located inside the metal cavities (6), the metal cavities (6) are provided with upper cover plates of the metal cavities (6) and lower bottom plates of the metal cavities (6), the first metal guide belts (5) are arranged in parallel with the lower bottom plates of the metal cavities (6), two ends of the first metal guide belts (5) bend downwards and penetrate through the lower bottom plates of the metal cavities (6) to be respectively used as left-handed feed ports of the first metal guide belts (5) and right-handed feed ports of the first metal guide belts (5), more than two cross seams (3) are uniformly formed in the upper cover plates of the metal cavities (6), and microstrip plates (1) are arranged above the upper cover plates of the metal cavities (6), more than two metal patches (2) are arranged on the surface of one side of the microstrip board (1) corresponding to the cross seam (3), the metal patches (2) and the cross seam (3) are arranged in a one-to-one correspondence mode, the vertical projection of the geometric center of any metal patch (2) on the plane where the first metal conduction band (5) is located is the central projection, and the axis direction of the first metal conduction band (5) deviates from the central projection.
2. The double circularly polarized linear array of strip-fed cross slits (3) as claimed in claim 1, wherein the two slits of the cross slits (3) are vertically crossed at 45 degrees positive and negative.
3. The dual circularly polarized linear array of strip-fed cross slits (3) as claimed in claim 1, wherein the geometric center of the cross slits (3) coincides with the geometric center of the metal patch (2).
4. The strip-fed cross-shaped slit (3) dual-circular polarized linear array as claimed in any one of claims 1 to 3, wherein a second metal conduction strip parallel to the first metal conduction strip (5) is further disposed in the metal cavity (6), the second metal conduction strip and the first metal conduction strip (5) are located in the same plane, the second metal conduction strip is located on the other side of the central projection, the first metal conduction strip (5) and the second metal conduction strip are symmetric about the central projection, both ends of the second metal conduction strip are also bent downward and pass through the lower bottom plate of the metal cavity (6) to serve as a left-handed feeding port of the second metal conduction strip and a right-handed feeding port of the second metal conduction strip, respectively, and the left-handed feeding port of the second metal conduction strip and the right-handed feeding port of the first metal conduction strip (5) are located on the same side.
5. The double circular polarized linear array with the wire-fed cross seam (3) as claimed in claim 4, wherein more than two dielectric support blocks (4) are further disposed in the metal cavity (6), the more than two dielectric support blocks (4) are fixed on the upper cover plate of the metal cavity (6), a gap is left between the two dielectric support blocks and the lower cover plate of the metal cavity (6), and the two dielectric support blocks wrap the first metal conduction band (5) and the second metal conduction band.
6. The double-circular polarized linear array of the strip-fed cross slit (3) as claimed in claim 4, wherein the first metal conduction band (5) is formed by splicing more than two first short metal conduction bands with equal lengths, the second metal conduction band is formed by splicing more than two second short metal conduction bands with equal lengths, the lengths of the first short metal conduction band and the second short metal conduction band are also equal, each of the first short metal conduction band and the second short metal conduction band has a first end and a second end, the first end of the first short metal conduction band and the second end of the second short metal conduction band are located on the same side, the first end of the first short metal conduction band serves as a left feeding port of the first short metal conduction band, the first end of the second short metal conduction band serves as a left feeding port of the second short metal conduction band, and the second end of the first short metal conduction band serves as a right feeding port of the first short metal conduction band, and the second end of the second short metal conduction band is used as a right-handed feeding port of the second short metal conduction band.
7. The dual circularly polarized linear array of claim 6, further comprising a low noise amplifier, wherein the first and second ends are connected to the microstrip line of the low noise amplifier.
8. The double circularly polarized linear array of strip-fed cross slits (3) as claimed in claim 1, wherein two or more of said cross slits (3) are arranged at equal intervals and two or more of said metal patches (2) are arranged at equal intervals.
9. The double circularly polarized linear array of strip-fed cross-slits (3) as claimed in claim 1, wherein the metal patches (2) are square.
10. The dual circularly polarized linear array of strip-fed cross-slits (3) as claimed in claim 1, wherein the metal cavity (6) is an air cavity.
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